Casting we do not feel strange, casting application has a long history.In ancient times, people made coin offerings, weapons, tools and some living utensils with castings.However, in modern times, the casting is mainly used in the blank of machine parts or directly used as machine parts.Casting in mechanical products began to account for more and more, the amount is also increasing year by year, casting shape, variety is also changing.Casting has gradually become an indispensable part of our daily life, all kinds of door handles, door locks, small water pipes and other occasions can see the use of casting.

The casting has excellent mechanical and physical properties, it can have a variety of different strength, hardness, toughness of comprehensive performance, but also can have one or more special properties, such as wear resistance, high and low temperature resistance, corrosion resistance.

Casting weight and size range is very wide, the lightest weight is only a few grams, the heaviest can reach 400 tons, the wall thickness is only 0.5 mm, the thickness can be more than 1 meter, the length can be from a few millimeters to ten meters, can meet the requirements of different industrial sectors.

Comparison of the differences between castings and stainless steel forgings:

1. Castings have good abrasion resistance and anti-shock function, because the graphite in cast iron is good for lubrication and oil storage, so the anti-shock performance of gray cast iron is better than that of steel.

2. The casting process performance is good. Due to the high carbon content of gray cast iron, which is close to eutectic composition, the melting point is relatively low, the fluidity is good, and the shrinkage rate is small, so it is suitable for casting complex structure or thin-wall castings.

3. The structure and mechanical properties of stainless steel can be improved after forging.Casting organization after forging method of thermal deformation due to the deformation and recrystallization of stainless steel, make the original bulky dendrite and columnar grain to grain is fine and uniform axial recrystallization organization, make the ingot in the original segregation, porosity, porosity, slag compaction and welded, such as its organization become more closely, plasticity and mechanical properties of the metal.

4. The mechanical properties of castings are lower than those of forgings of the same material.However, the forging process can ensure the continuity of the metal fiber structure, so that the fiber structure of the forging and the shape of the forging remain consistent, which can ensure that the parts have good mechanical properties and long service life.

No matter casting or stainless steel forging, is an indispensable part of mechanical production, in mechanical production, according to the different performance of the product, select the corresponding casting or forging, only give full play to the role of casting or forging, in order to have perfect mechanical products.Valve accessories